Fictitious and Symbolic Creatures in Art, by John Vinycomb, [1909], at sacred-texts.com

The Opinicus, or Epimacus

This creature appears to be a variety of the griffin family. Authorities blazon it as having its body and four legs like those of a lion; the head and neck and wings like an eagle, and the short tail of a camel, sometimes borne sans wings.

Such a monster with wings endorsed or, was the crest of the Barber Surgeons of London.

Two opinici vert, purfled or, beaked sable, wings gules, support the insignia of the Plasterers’ Company.